package com.zscat.common.utils;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 日期处理
 * 
 */
public class DateUtils {
	private final static Logger logger = LoggerFactory.getLogger(DateUtils.class);
	/** 时间格式(yyyy-MM-dd) */
	public final static String DATE_PATTERN = "yyyy-MM-dd";
	/** 时间格式(yyyy-MM-dd HH:mm:ss) */
	public final static String DATE_TIME_PATTERN = "yyyy-MM-dd HH:mm:ss";

	public static String format(Date date) {
		return format(date, DATE_PATTERN);
	}

	public static String format(Date date, String pattern) {
		if (date != null) {
			SimpleDateFormat df = new SimpleDateFormat(pattern);
			return df.format(date);
		}
		return null;
	}

	public static String getTimeBefore(Date date) {
		Date now = new Date();
		long l = now.getTime() - date.getTime();
		long day = l / (24 * 60 * 60 * 1000);
		long hour = (l / (60 * 60 * 1000) - day * 24);
		long min = ((l / (60 * 1000)) - day * 24 * 60 - hour * 60);
		long s = (l / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
		String r = "";
		if (day > 0) {
			r +=day + "天";
		}
		if (hour > 0) {
			r +=hour + "小时";
		}
		if (min > 0) {
			r +=min + "分";
		}
		if (s > 0) {
			r +=s + "秒";
		}
		r += "前";
		return r;
	}
}
